Responding to review feedback

Author: markcowl

src/Common/Commands.Common.Authentication.Test/ClientFactoryHandlerTests.cs

@@ -98,7 +98,6 @@ public void AddsAppropriateRetryPolicy()
                 account,
                 AzureEnvironment.PublicEnvironments["AzureCloud"]
             );
-
             AzureSession.Instance.AuthenticationFactory = new MockTokenAuthenticationFactory(userAccount, Guid.NewGuid().ToString());
             var factory = new ClientFactory();
             factory.AddHandler(new RetryTestHandler());
@@ -116,8 +115,6 @@ public void AddsAppropriateRetryPolicy()
             autoRestHandler.MaxTries = 0;
             task = autorestClient.ResourceGroups.ListWithHttpMessagesAsync();
             Assert.Throws<TaskCanceledException>(() => task.ConfigureAwait(false).GetAwaiter().GetResult());
-
-
         }
 
         private CancelRetryHandler EnsureHyakRetryPolicy<T>( Hyak.Common.ServiceClient<T> client) where T: Hyak.Common.ServiceClient<T>

src/Common/Commands.Common.Authentication/Factories/CancelRetryHandler.cs

@@ -26,6 +26,7 @@ namespace Microsoft.Azure.Commands.Common.Authentication.Factories
     /// </summary>
     public class CancelRetryHandler : DelegatingHandler, ICloneable
     {
+        const string TestModeVariableKey = "Azure_Test_Mode", TestModeVariableValue="Record";
         public CancelRetryHandler()
         {
             WaitInterval = TimeSpan.Zero;
@@ -53,13 +54,22 @@ protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage
                     }
                     catch (TaskCanceledException) when (tries++ < MaxTries)
                     {
-                        Thread.Sleep(WaitInterval);
+                        SleepIfRunningLive(WaitInterval);
                     }
                 }
             }
             while (true);
         }
 
+        void SleepIfRunningLive(TimeSpan timeSpan)
+        {
+            var testModeSetting = Environment.GetEnvironmentVariable(TestModeVariableKey);
+            if (string.IsNullOrWhiteSpace(testModeSetting) || !string.Equals(TestModeVariableValue, testModeSetting, StringComparison.OrdinalIgnoreCase))
+            {
+                Thread.Sleep(timeSpan);
+            }
+        }
+
         public object Clone()
         {
             return new CancelRetryHandler(WaitInterval, MaxTries);

src/Common/Commands.Common.Authentication/Factories/ClientFactory.cs

@@ -189,7 +189,6 @@ public virtual TClient CreateClient<TClient>(IAzureContextContainer profile, IAz
             }
 
             return client;
-
         }
 
         public virtual TClient CreateCustomClient<TClient>(params object[] parameters) where TClient : ServiceClient<TClient>